[Bug 1879012] Re: GRUB does not bring up networking when loaded over HTTP

[Lee Trager]

I modified MAAS to only provide GRUB and skip the Shim. In that case
HTTP boot still doesn't work. It looks like when GRUB is loaded over
HTTP it does not bring up networking. I can still manually load
networking with net_dhcp and specify the remote grub.cfg file. GRUB does
download the kernel and initrd the remote grub.cfg file specifies but it
looks like it never actually excutes them.

** Summary changed:

- Shim does not hand off networking during HTTP boot
+ GRUB does not bring up networking when loaded over HTTP

** Description changed:

  When using MAAS to HTTP boot on x86_64 UEFI grub drops to the command
  line. net_ls_addr shows the system has no address. If I run net_dhcp I
  get an address. I can then download the remote grub.cfg file and
  continue boot.
  
  When reproducing with QEMU you have to manually reconfigure the boot
  order to try HTTP before TFTP:
  
  # efibootmgr -v
  BootCurrent: 0002
  Timeout: 0 seconds
  BootOrder: 0002,0003,0001,0000,0004
  Boot0000* UiApp	FvVol(7cb8bdc9-f8eb-4f34-aaea-3ee4af6516a1)/FvFile(462caa21-7614-4503-836e-8ab6f4662331)
  Boot0001* UEFI QEMU QEMU HARDDISK 	PciRoot(0x0)/Pci(0x2,0x0)/Pci(0x0,0x0)/SCSI(1,1)N.....YM....R,Y.
  Boot0002* UEFI PXEv4 (MAC:00163E03BE1A)	PciRoot(0x0)/Pci(0x4,0x0)/Pci(0x0,0x0)/MAC(00163e03be1a,1)/IPv4(0.0.0.00.0.0.0,0,0)N.....YM....R,Y.
  Boot0003* UEFI HTTPv4 (MAC:00163E03BE1A)	PciRoot(0x0)/Pci(0x4,0x0)/Pci(0x0,0x0)/MAC(00163e03be1a,1)/IPv4(0.0.0.00.0.0.0,0,0)/Uri()N.....YM....R,Y.
  Boot0004* EFI Internal Shell	FvVol(7cb8bdc9-f8eb-4f34-aaea-3ee4af6516a1)/FvFile(7c04a583-9e3e-4f1c-ad65-e05268d0b4d1)
  # efibootmgr -o 0003,0002,0001,0004
  BootCurrent: 0002
  Timeout: 0 seconds
  BootOrder: 0003,0002,0001,0004
  Boot0000* UiApp
  Boot0001* UEFI QEMU QEMU HARDDISK
  Boot0002* UEFI PXEv4 (MAC:00163E03BE1A)
  Boot0003* UEFI HTTPv4 (MAC:00163E03BE1A)
  Boot0004* EFI Internal Shell
  
  grub> net_ls_addr
  grub>
  grub> net_dhcp
  efinet0:dhcp 00:16:3e:03:be:1a 10.0.0.75
  grub> configfile (http,10.0.0.2:5248)/grub/grub.cfg-default-amd64
  Booting under MAAS direction...
  
  The kernel and initrd are downloaded but it hangs there.
  
- I believe the bug is in grub or the shim. As MAAS receives its
- bootloaders from the stream at images.maas.io generated by lp:maas-
- images this affects all versions of MAAS.
+ I believe the bug is in grub. As MAAS receives its bootloaders from the
+ stream at images.maas.io generated by lp:maas-images this affects all
+ versions of MAAS. Currently MAAS uses GRUB and the Shim from Bionic
+ however I have been able to reproduce this bug using GRUB and the shim
+ from Focal as well.

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https://bugs.launchpad.net/bugs/1879012

Title:
  GRUB does not bring up networking when loaded over HTTP

Status in MAAS:
  Confirmed
Status in grub package in Ubuntu:
  New
Status in shim-signed package in Ubuntu:
  New

Bug description:
  When using MAAS to HTTP boot on x86_64 UEFI grub drops to the command
  line. net_ls_addr shows the system has no address. If I run net_dhcp I
  get an address. I can then download the remote grub.cfg file and
  continue boot.

  When reproducing with QEMU you have to manually reconfigure the boot
  order to try HTTP before TFTP:

  # efibootmgr -v
  BootCurrent: 0002
  Timeout: 0 seconds
  BootOrder: 0002,0003,0001,0000,0004
  Boot0000* UiApp	FvVol(7cb8bdc9-f8eb-4f34-aaea-3ee4af6516a1)/FvFile(462caa21-7614-4503-836e-8ab6f4662331)
  Boot0001* UEFI QEMU QEMU HARDDISK 	PciRoot(0x0)/Pci(0x2,0x0)/Pci(0x0,0x0)/SCSI(1,1)N.....YM....R,Y.
  Boot0002* UEFI PXEv4 (MAC:00163E03BE1A)	PciRoot(0x0)/Pci(0x4,0x0)/Pci(0x0,0x0)/MAC(00163e03be1a,1)/IPv4(0.0.0.00.0.0.0,0,0)N.....YM....R,Y.
  Boot0003* UEFI HTTPv4 (MAC:00163E03BE1A)	PciRoot(0x0)/Pci(0x4,0x0)/Pci(0x0,0x0)/MAC(00163e03be1a,1)/IPv4(0.0.0.00.0.0.0,0,0)/Uri()N.....YM....R,Y.
  Boot0004* EFI Internal Shell	FvVol(7cb8bdc9-f8eb-4f34-aaea-3ee4af6516a1)/FvFile(7c04a583-9e3e-4f1c-ad65-e05268d0b4d1)
  # efibootmgr -o 0003,0002,0001,0004
  BootCurrent: 0002
  Timeout: 0 seconds
  BootOrder: 0003,0002,0001,0004
  Boot0000* UiApp
  Boot0001* UEFI QEMU QEMU HARDDISK
  Boot0002* UEFI PXEv4 (MAC:00163E03BE1A)
  Boot0003* UEFI HTTPv4 (MAC:00163E03BE1A)
  Boot0004* EFI Internal Shell

  grub> net_ls_addr
  grub>
  grub> net_dhcp
  efinet0:dhcp 00:16:3e:03:be:1a 10.0.0.75
  grub> configfile (http,10.0.0.2:5248)/grub/grub.cfg-default-amd64
  Booting under MAAS direction...

  The kernel and initrd are downloaded but it hangs there.

  I believe the bug is in grub. As MAAS receives its bootloaders from
  the stream at images.maas.io generated by lp:maas-images this affects
  all versions of MAAS. Currently MAAS uses GRUB and the Shim from
  Bionic however I have been able to reproduce this bug using GRUB and
  the shim from Focal as well.

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